In Ankeny, the major players are Kimberley, Hubbell, Greystone, Jerry's, Gardner, Tyler, and Grubb. There's others, but these are the more common ones.
Of these, Grubb is probably the one to stay away from, I had a home inspector tell me straight up that Grubb "has a lot of problems". Also stay away from anything Regency, and any Jerry's more than 2-3 years old.
Jerry's has some newer homes in our area, and I have to say they're a lot better than they used to be -- but I think it depends on the price point, as it does with all of them.